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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income Tax Disclosure [Line Items] |  |  |  |
Income tax expense (benefit) | $ 50 | $ (416) | $ 3,961 | $ 1,379
Maximum | European Subsidiary |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Income tax expense (benefit) | $ 100 |  |  |
Aduro |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Income tax expense (benefit) |  | $ (400) | $ 4,000 | $ 1,400

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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